diff --git a/src/Agilent4uhv.cpp b/src/Agilent4uhv.cpp
index 8a278d421857549e72cc810ca3a4f191a1cb94b8..b650d7d71a2b43b04d33dce31aec1c9540c955c3 100644
--- a/src/Agilent4uhv.cpp
+++ b/src/Agilent4uhv.cpp
@@ -1813,9 +1813,7 @@ void* Agilent4uhvWorker::run_undetached(void * /*ptr*/)
 			/* Restart from begin */
 			it = device->polled_windows.begin();
 			/* Set UNKNOWN state */
-			static const int m[] = {STX, ADDR, '2', '0', '5', READ_WINDOW,
-				'1', '1', '1', '1', '1', '1', ETX, 0x38, 0x34};
-			vector<unsigned char> message(m, m + sizeof(m) / sizeof(m[0]));
+			vector<unsigned char> message(6, '1');
 			device->cache.set(205, message);
 			assert(false);
 		}